They usually have the medicine_______ before putting into the market all over the country.
#95721
A
testing out
B
to be tested out
C
being tested out
D
tested out
推荐题目
. _______ the meeting room,he found all the parents already _______ there.
#98463
A
To enter; sitting
B
Stepping into;to seat 
C
Entered; seat
D
Entering;seated
---I’m wondering why the visitors chose to stay with the host family. --______ real local life.
#91701
A
Experiencing
B
Experience
C
To experience
D
Having experienced